C++写一个立方体类

理解成员函数和全原函数的区别

设计立方体类(Cube)

求出立方体的面积和体积

分别用全局函数和成员函数判断两个立方体是否相等。

这个立方体相等并非在空间坐标系严格相等，我们把他当做现实中的一个物体，如果把这个立方体推倒，那么他的长宽高会有改变，所以我们不能只判断长宽高分别相等的立方体为同一个立方体，那样太狭隘了，要判断六次

#include 
using namespace std;

class Cube
{
public:
	//设置长宽高的set,get
	void setLength(int l)
	{
		m_Length = l;
	}
	int getLength()
	{
		return m_Length;
	}
	void setWidth(int w)
	{
		m_Width = w;
	}
	int getWidth()
	{
		return m_Width;
	}
	void setHeight(int h)
	{
		m_Height = h;
	}
	int getHeight()
	{
		return m_Height;
	}
	//面积
	int cubeS()
	{
		return 2 * (m_Length * m_Height + m_Width * m_Height + m_Length * m_Width);
	}
	//体积
	int cubeV()
	{
		return m_Length * m_Width * m_Height;
	}

	bool isSameClass(Cube& c2)
	{
		if (m_Length == c2.getLength() && m_Width == c2.getWidth() && m_Height == c2.getHeight())
		{
			return true;
		}
		else if (m_Length == c2.getLength() && m_Width == c2.getHeight() && m_Height == c2.getWidth())
		{
			return true;
		}
		else if (m_Length == c2.getHeight() && m_Width == c2.getWidth() && m_Height == c2.getLength())
		{
			return true;
		}
		else if (m_Length == c2.getHeight() && m_Width == c2.getLength() && m_Height == c2.getWidth())
		{
			return true;
		}
		else if (m_Length == c2.getWidth() && m_Width == c2.getHeight() && m_Height == c2.getLength())
		{
			return true;
		}
		else if (m_Length == c2.getWidth() && m_Width == c2.getLength() && m_Height == c2.getHeight())
		{
			return true;
		}
		else
		{
			return false;
		}
	}

private:
	int m_Length;
	int m_Width;
	int m_Height;
};

bool isSame(Cube& c1 ,Cube& c2)
{
	if (c1.getLength() == c2.getLength() && c1.getWidth() == c2.getWidth() && c1.getHeight() == c2.getHeight())
	{
		return true;
	}
	else if (c1.getLength() == c2.getLength() && c1.getWidth() == c2.getHeight() && c1.getHeight() == c2.getWidth())
	{
		return true;
	}
	else if (c1.getLength() == c2.getHeight() && c1.getWidth() == c2.getWidth() && c1.getHeight() == c2.getLength())
	{
		return true;
	}
	else if (c1.getLength() == c2.getHeight() && c1.getWidth() == c2.getLength() && c1.getHeight() == c2.getWidth())
	{
		return true;
	}
	else if (c1.getLength() == c2.getWidth() && c1.getWidth() == c2.getHeight() && c1.getHeight() == c2.getLength())
	{
		return true;
	}
	else if (c1.getLength() == c2.getWidth() && c1.getWidth() == c2.getLength() && c1.getHeight() == c2.getHeight())
	{
		return true;
	}
	else
	{
		return false;
	}
}

int main()
{
	Cube c1;
	c1.setLength(5);
	c1.setWidth(3);
	c1.setHeight(4);
	cout << "c1的面积为：" << c1.cubeS() << endl;
	cout << "c1的体积为：" << c1.cubeV() << endl;

	Cube c2;
	c2.setLength(3);
	c2.setWidth(6);
	c2.setHeight(5);
	cout << "c2的面积为：" << c2.cubeS() << endl;
	cout << "c2的体积为：" << c2.cubeV() << endl;

	bool res = isSame(c1, c2);
	if (res)
	{
		cout << "这是两个相等的立方体（通过全局函数判断）" << endl;
	}
	else
	{
		cout << "这两个立方体并不相等（通过全局函数判断）" << endl;
	}
	bool res1 = c1.isSameClass(c2);
	if (res1)
	{
		cout << "这是两个相等的立方体（通过成员函数判断）" << endl;
	}
	else
	{
		cout << "这两个立方体并不相等（通过成员函数判断）" << endl;
	}

	system("pause");
	return 0;
}